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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '905beb027f3dc9f541b9a78deb8c07dafb3305b7750a6687dd095ddfee25fbc9' 
  AND token = 'ZQmxXixZC5W48ho5xUFaKkZQ1iqiHO0f2gqj0+0fhz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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