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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cce636ed4eca9c9b222793305f9440c0adf439c1ced8552b01639675cafb81f2' 
  AND token = '/Ob+YCIYkc5kRrIcO/6bHNtrAAa4U2U1BLo2fVu+SsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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