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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bfa881d093e66ea06ec3fc6db83e449e3e889d810c4436d42d8b17061162348' 
  AND token = 'WEPr4dNyNcDsOfEIfRGCxugSt+T8qdAtut64Bfmy3HU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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