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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63b0aadfabb7066383b63fc409f9e7ade05a3eb42f984bed3b9772446ca7c5f6' 
  AND token = 'lN9xZjUkC4MP8wmswerrH0NkCeOfPIT7PM4na7d0ZME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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