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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9379857a2b5ffe338964bc9c3b41d85a47a5476ff285383f500d45e709bde731' 
  AND token = '9Wm5syVsU0ezwpnZ5VR740oD9m9uWwuaQZFGA2qlNMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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