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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b446a6407ee460e65056adee333cbddbd6c74e945e14bd886cf00cd2e4e15b3f' 
  AND token = 'z7fS4r+No4/0tlRxNacs7D0b5pxIdYsAZjIbZf/maX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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