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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cea39baa289de237dffb731b8dd6eacd1aace6b26ee0325ee69f45348d2370c' 
  AND token = 'ka7QiHGEEty3obOxHQB40okZ+BonDyt+GyVmpOceB60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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