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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f71ff1b4a88a7d2e50e9e409bffd47e8e6374614b4a8f933b53492c1e213998c' 
  AND token = 'E+xqZ+xStJou8E2h0xqlhVD2Ab5vGISywTv0OyPl4rY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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