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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9a103f4c51539878d25f874adf59a19b20b20ff00535c82684aafa3176c4b7f' 
  AND token = '8q2expQy+lXvMetl35qEtEi9Uk5UDutqfl/PWlDInMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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