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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e86530461f1821a454132f8e5eeb45c2402970df1e686ee8e1cc67d766a8005' 
  AND token = '3qdM8FocVIJZF9iVkjyrbRiSOV7onLDstk0EnlZFdDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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