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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d82aea32f73e759546afb4ef5e992050f6b518ec3ea5043f1efd00c25b4ec9d' 
  AND token = 'Co+Ztgf0sCjyyugjqHE5vsw678IXilvRhjky/RY+tvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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