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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61a8f83b0162b93d100e4889ec8b189c10113b28d2d06890f94ff5fa661fe9fb' 
  AND token = 'rNUlhUEV7vzUJCyLdgIuHrRT7UL4QpCYNGZ94fz21es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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