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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f574c6ce58d2ae5c6976854bac2c5950a0bdd63436ba53c5c202deb2788beb4f' 
  AND token = '6+2wCeQhKiIFdWrmXqnCnheb83TSUnYyXD00YgbRVXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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