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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f26fc20daba456b0e42b0a3cff0a6986d06fb04da4197c7ea119e853e21b3c5' 
  AND token = 'r4kckjRbUyMmTXj+w07ndq9AdDK0o4O1bFKx+qlAqPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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