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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e565139c1f10b8f68291f227858099b0a0ea5c96db5d89fdba5ac4c4130dcb0' 
  AND token = 'dNMW91sGWns8aWzZAHC9pIynHw57DfWoh8NOXKFwIJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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