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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96b2f98ad6378b0337d7e9332708490f65c8c9721aa4d5c2421df84b4083e2f1' 
  AND token = 'BwKko1dhqUo1qWc+/PKqgpcycrbSHoxbNak5EepipKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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