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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9db744946fff70e88a0246cbf377e76c7e088e4b13ffafe5529a25adf79ac73' 
  AND token = 'T0GS6Gy58Hj+Z43JV7GVSR5I3czDumQAP4wuUf/xiHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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