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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd3aed36fac616354b7c42acf8a42f55f7adc8b1c8d08d56c142e7f51cc837b3' 
  AND token = '3zTZnXY+bl85dr77O4evz4S1h2YF/NOanPglWB4mTvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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