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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20a5d53543d8f5d30df961a5f24f701c90e20ca1b394ba6e5495654e5feccbd1' 
  AND token = 'rWbwjALkTvabl0JobcIgpejlCnT9NprzIOsIUU0/V+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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