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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63299b5bcdc8a47729a6a6e900a2ed9924eb5f9e6e20ac92172cc5cd36512005' 
  AND token = 'fetpeTamOmzNBn2ZomWsK3dRtJlyYzjMjF5J//k4nSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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