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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ec961ba133d39d7dfa57cb45602d6669acceab94270e15e19ee19668df2ed6d' 
  AND token = 'mK9RaAzk8o61WDi4tdyJFt7gBJj2mkkbhn5BzDaryaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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