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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd5e08b8fc77d120b1f8de1e778c291b75468e03557eb49beefbd3fbeb084d70' 
  AND token = 'PsZpXLcpsBYGz5Qg+GrNN7GZyIx6+3yNm9WrvuNJ9xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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