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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9d1fe03e5f34ccc2eb177ec6cae891c503663a9af08fbd9ed5c9cb687f777f6' 
  AND token = 'R8BbsGxV6DdQzm73WB7tmb5B9uEWPM1Qf33vqHkF65w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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