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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20eab210544408d5375bf9abed4dbb9ed4c8d5448a8b83e11fda50bb287120c9' 
  AND token = 'TgzL4NP7LmFagmrkNYyuLuhhHzBcP2Zp/TXjx2woLDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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