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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b0e88c7885d14ab70175bba1ce9674ec9af4804aefe01a4ccae3846c3586f73' 
  AND token = 'TcpKm/8GVIz+L5UJr/U3IcJ0e0igm0VrH+fRkTLhJxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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