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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6476c6913ad0b407c0ced9e15f43a86dc54daa61109bdb99197c51f15359b713' 
  AND token = 'EoGnW/66AitYrZ/+51pF66V+benuNfFKkFELOZqVSXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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