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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aa28d3c27735a26bea6f1e77c6e14bfa00d9e8d88484673df37977d5fdd14b7' 
  AND token = 'I2/yuF1DwTBfRAXjyniUPQ192MpSuBeCf5QRPJXzuSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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