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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7da396d9b7fdae4326898628a119a2d0452863784bec1333cf0dc7161a36bf1' 
  AND token = 'N8QiDWaaJwn6Xa3yOO8tv1ATXSBuxg7siGQLtONNVdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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