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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d6254252efbabfc53135b3ee767dd2c85ee518c8cad8794f0f199c19ded22a5' 
  AND token = 'SpD4niDVFULVWZxEf9xpL2hUkx2Nb72QRc8NgZTfOnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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