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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25f5e059f1697472a52dba4bc349b130e30c5cab7dd3ff73ab864e6e49477b7b' 
  AND token = 'D/4QUv0ru/d4fszVyDmKPUK/9xkq27yL4HsksVltR/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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