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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36c94de8e4fbced9743c834cfdcba3879ad6fe48a5fd03efe7cb1e5f11292290' 
  AND token = 'tBFxhfnqRc66jS+46R6Z+QiKt1HDyDobWk/7rO3DU5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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