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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcdd2646ea936d64ece79e36886bd1942f6224edead52719ed1f3f1da2cf6fb9' 
  AND token = 'uX/6PBtkYtERHpo5WFpfmB8WjJclWcfypMPZ7HM88Ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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