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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd80f1fde2602b0d0d01d05bbec436d74ea4dead97ee712b4dea31744edc9183' 
  AND token = 'XX9Jr6SAVa6XFsoLj8nIdPX4L7koH5S0Ca68/dXinao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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