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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ba01ee260e54dbe3ba126cb8b7901d2bc89971da66010bfa2972088e6d069c6' 
  AND token = '7PYPSTyfAJPWPoYjwiUZ4nqkxj3biouc8IUR7S7nVNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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