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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f990814e550971d472c5e1634b0480c3d15575d318f5109530a29ae527f0d0d' 
  AND token = 'W1ZSEIHjioiD+OyJ4mcoLaKfgmgx1HkK7Hs51sxXfqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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