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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6cab56a957d2e68a3d7522e97c02cb92016c767fc752878c25090f4359631ad' 
  AND token = '8Ip2PIHrXzFgUaxglpqpeqpmUKLb3mL9j3Uw6Zroxs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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