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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '055d2caffdd71a6cc89cf7e31dda0606dc2bfab7a19145e508fb276cf08913ae' 
  AND token = 'LkYXlbuj3rGg2YbjatDYY1pqG8ShYFdEdznSg12ev98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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