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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42b71515cdf573ccbe595e7d843bf91de4531a432e216c78264edae316e75510' 
  AND token = 'Soo30rDunWEztrHiF8DrnaMZibJ6u/Je//tQCLSLwjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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