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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ad40ac5abd6af8a97fce619df98ee16c048e236dd65dce8d99a640e62a27e07' 
  AND token = 'AWRZba5dqfRgUDZmj8uKuG4BvZCriNdq2yeS8LMd3vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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