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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '103fa83868215de5498fa423a6450fcc70c18f580e1227b3c04a8af0da20b2bf' 
  AND token = 'PXBuLrBqod7M+Sh3WAzbG1r9VuurUODJT+4cp7eP+xI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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