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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eec4ea20e57aa09eff3b97cc3698a2ef93a9c984b37697d9734a5fb65c5b9f9b' 
  AND token = 'vJQSHzDAE15iws02zDn7/Oz83XenhkT7uLimlmZuZ7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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