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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67de63ad189c83005a79621da606e92a29e10fd16fa69a65f14bf3bc2bef421b' 
  AND token = '1PuxQi6Pe86rMTJiyS00WkGgUTI8Ke6XnWIYIw2hcy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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