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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3836dc7f38ac5702396e0c2b9860a9d83c20b18d0cd94459fdbcf75e506e6077' 
  AND token = '7fC7zqJTABkKu4DOT8yfmB5TUZPLv/rCCiSjMOc5In4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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