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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2eceaaf0cd863496e36ddbbf3d45c36100f2e142df3339daae80c685945e9a5' 
  AND token = '3bye2M4YZus43nRa9cCsKH08OyTx8wXcA0aMw7wv71Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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