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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa1f13efc27d3dce8b35315bacb7ae38ce78cd1e4acf6ff3bbe7427e59f745b1' 
  AND token = 'lFZoDit2PZntt29jGnkhmGRbTrX5zXIWeWn/3xIHhAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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