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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce09302fe733ac2819da3b9e3db4d80877806aecef88312f741c0cebb1131e5b' 
  AND token = 'Ttu8ynHYN7AxiVOM/MPR2zzLz7rnCsmB1Y5yw+WoqRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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