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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df82eb5041c115b3284ad4650b0aa80f98f10751b1365f2c87a820f4651d28df' 
  AND token = '82r4AhB1ILtDg3Ljn/kV7dTfAMWA70OyKS16EL7Dnyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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