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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '815552d361882d4a96603dfed89aae3ab28c4baab845f91ece882b717258f5c1' 
  AND token = 'DwsHTK1jk7IzwmcVZlAM2u1FL/9tnW/wNF6H2uJ5xPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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