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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '570211ac5cef97fa7247d932a68b03c4e13b12d0c98dd488097e7a5123786cdf' 
  AND token = 'u8fY510SpwMi3DG1VEScA9yIl3F7RUZtRQvydFBNTZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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