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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4b791a608cfcd9e86b75bb05f294da8321c475e9c7e6d13b9c72b1d43df81de' 
  AND token = 'FzGK4HUl3QgHl7PAAsq4U6Ldp1xAoOsedQgbx1stFGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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