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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4c018d2131939a1a19a201add0c1c306d3b2bb5db63e513b26fb8e715ebb846' 
  AND token = '3kjFb6JtLuwHed/1JhQTBnBq74IWB+QnoeaxyOJmR4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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