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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a5c692c684924a50c0b2391bfb04c0703440c20e061dabd872f8a134a51f868' 
  AND token = 'LgDCyZxDouJ2w2aslIcb+tCIMJcB1kAM0J319EZDzow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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