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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32a2cbc736e9cf0800f69b61911953191d8f674faf2bbd43ed57481ffe6735f4' 
  AND token = 'XiXTKHhd0l0s4WyhhTB7SIBo4ZHvDa7zV4Zkk8kDCo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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