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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7295102a325c1dd8c01a12d077d37006b354bb1d2674b9ee00cd2b923b896d6d' 
  AND token = 'PA4Q4MmYaucM8/XGGKlZKKwxjwP+ZNcol8WoQIPOvvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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