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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9b369ec42ac078322b6e6497fa8ed4dc87a3bf7fc5b8e62700256efd8cbb0e7' 
  AND token = 'naaQM10OrrD3I48KV/pfJeRdaRVLXRUlAezazi+nkPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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