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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc05f2ac09d4486816503d22aa83dfa802d5a72b5f8b2731708b12593863c76e' 
  AND token = 'Rsr9Ni8KiNbu36OK+/g70GyIr8gx/rHLhNft/NTKZYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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