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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d1bc50eb85d0f93ba97f5d3e73ea66931e6da703aa9c6815ff4a0d5c0e190fc' 
  AND token = 'dZeaLeXOvpQ3Il0ZJVdCVNAm58xKxaIBMupabRpCEvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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