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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8b04d73fbe8cc8986033985904c9da86ad3ac826bfd0ffe1d89c81a29d972f4' 
  AND token = '3pGrdSWNUOPejsWK3FXW+Ja0feh68aU6NInSjEHnyLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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