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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be9051234759facd0497df3684fed9724d2e7530d37aa446ea449c64dd6ec648' 
  AND token = 'sOnnoT0Q+1K7xJW7JpmheCjiHtqh8kQdJW9v4lehZQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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