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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8cdc06a3580d668c4ec963b70d6a6af1b6a9325b027279982be9b17acc69685' 
  AND token = '40GR0iwBzHByA9V1xfUSRpkMwVhweCgZfPJGadcSXjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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