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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dcd6aa8b824620646307307ad022f3ffb504b7ab33bf12a8f90ce0bd7ee7ea5' 
  AND token = 'q/DXJY1owxgwm6RY2icqPX6K58+8Y1Urpspvk2dYCII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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