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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5529dc11b68febf855f77e1e1ddd8e70cf502894b95011dacbc66290ab6ae81' 
  AND token = 'FA9tlqbNf39RvZQ6u1k8j8Z7ldplynZhpHKObus2+MM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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