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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93a9bed4e37aa151bfb8c1aa6a39ebe33322b03c808d1f853b85cfcef44e19c1' 
  AND token = 'CTXn5U2ERFN3YlfyOEPjZm52yfeeJvIKkvQf+70IkPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}