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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc8b191d7e72eda0f43cc8aaf670748715f4d7f3044fe7d7f02c392394666287' 
  AND token = 'BCmtO5VeDd9X6/OX50KNgmowsJUCrusaMvld38HrudY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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