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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c988b537f67a592e689dc90fde01655bd10e840125eba35ebe2cdd4a6651ead' 
  AND token = 'AXitH3i+kVE6Y4Jh4lY0Eq/+4D5grAf4Gm8izyWSfXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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