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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2eaf28501de57a2bd06bb7455c7666c95916ee3d84300ae68c775aafe6606c4' 
  AND token = 'Xxkoktho+xFjY1MZYIWYA3RIj2Vt2Mg7Hu3WDVq6a1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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