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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce9d5cfc811598ee5708d168092909619bd9f5b50d6d3d9e153c86b9594fa5f5' 
  AND token = 'bSTVpBeSpjNn9bg4mUu9AausVKqRXmshL/FdbFVN5kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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