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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fa06847ddacf2adaf07838e619d7b77effa5f92c289ea7384de5f6ec6ec016c' 
  AND token = '6hIjURlbqqXegTsbBk0wG7ZMQx9BTs4aUIfQxM+kwig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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