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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86d1ad7bbdf9fbf688e1076f32cf59de600c126cbf926f537d08caa4474b14a1' 
  AND token = '5boWVBU9FmDkuAZuJfoe1HKR/RZ3mKmdsxoscaty1ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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