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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dd0edb08b5f9c7ad1ad6b6c2e4dcdef5dcf0fc4e1238379eec996b88192384e' 
  AND token = 'P0B6hTpJSq6fmr7W08x9dBc3GxhvyWGFTRTfY5FRGC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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