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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cccc739643652a1aed4aab16d07d6ee177847f5aeb73d404745b36b17b80c5aa' 
  AND token = 'CBZ4tItwg+n7zWmU7s0qNobtzxNXDJV7RncRtdFOaPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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