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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1550ce7aee207d4e0bb1730fe28e684f65903013dda22ce064f54f14828a8cbd' 
  AND token = 'fLdGOve847I+9slLmlyr9vSW1MP5z0KTcquCp2LO/JA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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